I heard Messenger of Allah ﷺ as saying: When any one of you stays at a place, he should say:" I seek refuge in the Perfect Word of Allah from the evil of that He created." Nothing would then do him any harm until he moves from that place. Abu Huraira reported that a person came to Messenger of Allah ﷺ and said:" Messenger of Allah, I was stung by a scorpion during the night. Thereupon he said: Had you recited these words in the evening:" I seek refuge in the Perfect Word of Allah from the evil of what He created," it would not have done any harm to you.  

أَنَّهَا سَمِعَتْ رَسُولَ اللَّهِ ﷺ يَقُولُ إِذَا نَزَلَ أَحَدُكُمْ مَنْزِلاً فَلْيَقُلْ أَعُوذُ بِكَلِمَاتِ اللَّهِ التَّامَّاتِ مِنْ شَرِّ مَا خَلَقَ فَإِنَّهُ لاَ يَضُرُّهُ شَىْءٌ حَتَّى يَرْتَحِلَ مِنْهُ قَالَ يَعْقُوبُ وَقَالَ الْقَعْقَاعُ بْنُ حَكِيمٍ عَنْ ذَكْوَانَ أَبِي صَالِحٍ عَنْ أَبِي هُرَيْرَةَ أَنَّهُ قَالَ جَاءَ رَجُلٌ إِلَى النَّبِيِّ ﷺ فَقَالَ يَا رَسُولَ اللَّهِ مَا لَقِيتُ مِنْ عَقْرَبٍ لَدَغَتْنِي الْبَارِحَةَ قَالَ أَمَا لَوْ قُلْتَ حِينَ أَمْسَيْتَ أَعُوذُ بِكَلِمَاتِ اللَّهِ التَّامَّاتِ مِنْ شَرِّ مَا خَلَقَ لَمْ تَضُرُّكَ